English verb conjugation
MUST SOFTEN

Regular verb: soften - softened - softened

Affirmation

Simple form	V-ing form
I must soften you must soften he must soften we must soften you must soften they must soften	I must be softening you must be softening he must be softening we must be softening you must be softening they must be softening
Perfect	V-ing perfect
I must have softened you must have softened he must have softened we must have softened you must have softened they must have softened	I must have been softening you must have been softening he must have been softening we must have been softening you must have been softening they must have been softening

Negation

Simple form	V-ing form
I mustn't soften you mustn't soften he mustn't soften we mustn't soften you mustn't soften they mustn't soften	I mustn't be softening you mustn't be softening he mustn't be softening we mustn't be softening you mustn't be softening they mustn't be softening
Perfect	V-ing perfect
I mustn't have softened you mustn't have softened he mustn't have softened we mustn't have softened you mustn't have softened they mustn't have softened	I mustn't have been softening you mustn't have been softening he mustn't have been softening we mustn't have been softening you mustn't have been softening they mustn't have been softening

Interrogative form

Simple form	V-ing form
must I soften? must you soften? must he soften? must we soften? must you soften? must they soften?	must I be softening? must you be softening? must he be softening? must we be softening? must you be softening? must they be softening?
Perfect	V-ing perfect
must I have softened? must you have softened? must he have softened? must we have softened? must you have softened? must they have softened?	must I have been softening? must you have been softening? must he have been softening? must we have been softening? must you have been softening? must they have been softening?

Interro-negative form

Simple form	V-ing form
mustn't I soften? mustn't you soften? mustn't he soften? mustn't we soften? mustn't you soften? mustn't they soften?	mustn't I be softening? mustn't you be softening? mustn't he be softening? mustn't we be softening? mustn't you be softening? mustn't they be softening?
Perfect	V-ing perfect
mustn't I have softened? mustn't you have softened? mustn't he have softened? mustn't we have softened? mustn't you have softened? mustn't they have softened?	mustn't I have been softening? mustn't you have been softening? mustn't he have been softening? mustn't we have been softening? mustn't you have been softening? mustn't they have been softening?